A hybrid mesoporous material functionalized by 1,8-naphthalimide-base receptor and the application as chemosensor and absorbent for Hg2+ in water.

https://www.kau.edu.sa/Files/130/Researches/60281_31089.pdf

Part 1. Spectrophotometric determination of trace mercury (II) in dental-unit wastewater and fertilizer samples using the novel reagent 6-hydroxy-3-(2-oxoindolin-3-ylideneamino)-2-thioxo-2H-1,3-thiazin-4(3H)-one and the dual-wavelength β-correction spectrophotometry

We have synthesized a new fluorogenic compound L, which can selectively bind and sense Hg2+ in aqueous medium over a broad pH range. It exhibits excellent selectivity for Hg2+ over a large number of competitive cations (Fe3+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Ag+, Cd2+, Pb2+, Ca2+, Mg2+, Na+, K+). The sensing ability of the ligand is studied by fluorescence and UV-vis spectroscopy. Hg2+ present even in a nanomolar range can be detected. The effectiveness of L for detecting Hg2+ inside live human cancer cells (HeLa) is also examined. The hydrophobic part of L is efficiently employed for the quantitative extraction of Hg2+ from an aqueous medium into the organic layer. The extraction ability of L is also estimated by NMR, fluorescence and atomic absorption spectroscopy showing that approximately 99% of the Hg2+ ions are extracted. These results imply that the compound has potential application for sensing and removal of Hg2+ ions from waste water in a large cross-section of mercury threatened zones around the world.

Selective sensing and efficient separation of Hg2+ from aqueous medium with a pyrene based amphiphilic ligand

The reactivity of di-iodine towards thiourea (TU) and its derivative methylthiourea (MeTU) was studied. A diversity of products was obtained from these reactions. TU reacted with di-iodine in the absence or presence of hydroiodic or hydrochloric acids in a 1 : 1, 1 : 1 : 1 or 1 : 1 : 2 (TU : I2 : HX (X = I, Cl)) molar ratio to form the ionic compounds [(TU2)2+2(I−)·H2O] (1), [2(TU2) 2+·(Cl−)·2(I−)·(I3−)] (2) and [(TUH)+ (I3−)] (3). The compounds [(TU2)2+(Br−)(I3−)] (4) and [(TU2)2+2(Br−)·H2O] (5) were derived from the reactions of TU with di-iodine in the presence of hydrobromic acid in a 1 : 1 : 1 or 1 : 2 : 1 (TU : I2 : HBr) molar ratio. However, when the product of the reaction between TU and di-iodine in a 2 : 1 (TU : I2) molar ratio was crystallized in acetone–ethylether media the ionic salt of formula [(DAThdH+)(I−)] (6) (DAThd = 3,5-diamino-1,2,4-thiadiazole) was obtained. Methylthiourea (MeTU) reacted with di-iodine in the presence of hydrobromic acid (1 : 1 : 1, MeTU : I2 : HBr) in dichloromethane to form a solid product which gives [2(MeTU2) 2+·(2Br−)(I42−)] (7). Moreover, MeTU reacted with I2 in 2 : 1 (MeTU : I2) to form an intermediate powder product which was crystallized in acetone to give the 2-amino-3,4-dimethylthiazolium cation in [(DMeAThH+)(I−)(H2O)] (8). Upon changing the crystallization medium to ethanol, instead of acetone, the cationic 5-amino-3-methylamino-4-methyl-1,2,4-thiadiazolium (AMeAThdH)+ in [(AMeAThdH+)(I3−)] (9) was formed. The compounds were characterized by m.p., FT-IR, UV-Vis, 1H-NMR spectroscopy and mass spectrometry. The crystal structures of compounds 1–9 were determined by X-ray crystallography.

https://pubs.rsc.org/en/content/articlepdf/2014/dt/c3dt53302f

Fundamental chemistry of iodine. The reaction of di-iodine towards thiourea and its methyl-derivative: formation of aminothiazoles and aminothiadiazoles through dicationic disulfides.

/pdf/optical-test-strip-for-trace-hg-ii-based-on-doped-sol-gel-3s2npauvgk.pdf

Optical test strip for trace Hg(II) based on doped sol-gel film.

Synthesis of a novel bistriazene reagent 4,4'-bis[3-(4-phenylthiazol-2-yl)triazenyl]biphenyl and its highly sensitive color reaction with mercury(II).

5-Methyl-2-[3-(4-phenylthiazol-2-yl)triazenyl]benzenesulfonic acid as a chromogenic reagent of N-cetylpyridinium chloride Synthesis, mechanism and analytical application.

Ke-Qing Ling

Papers

Synthesis of a novel bistriazene reagent 4,4'-bis[3-(4-phenylthiazol-2-yl)triazenyl]biphenyl and its highly sensitive color reaction with mercury(II).

5-Methyl-2-[3-(4-phenylthiazol-2-yl)triazenyl]benzenesulfonic acid as a chromogenic reagent of N-cetylpyridinium chloride Synthesis, mechanism and analytical application.